Hey there,
I’ve tried to use the following setup to pipeline my workflow with a Game/Server testing thing:
&stc=1
However, when I’m trying to launch, I get this error message from the Game instance. The Server loads up just fine:
&stc=1
It is the default map set for the Game instance. It doesn’t matter what map I have opened in the editor at the moment or if I try to specify another map on the command line. I still get this error about this default map:
&stc=1
I’ve cooked my content through ‘File->Cook content for <platform>’ and I have it in my <project>/Saved/Cooked folder indeed, though, I don’t quite understand where are the settings for this cooking process? I have my packaging settings set like that:
&stc=1
Looking at the log file it seems that the server is using some temporary copy of the map currently opened in the editor (its is Map_01, indeed). This is the command line passed to the Server instance:
&stc=1
And this one is being passed to the Client:
&stc=1
I’m pretty sure I’m just missing some ‘secret knowledge’ of how things work internally. Would be great if someone from Epic can explain this topic once and for all 
Right now I’m using staged builds via UnrealFrontend, but it’s a bit time consuming and the ability to iterate on stuff right out of the editor would be really nice to have.